BOSTON (AP) — With graduation approaching, a time for celebration turned somber at Boston University on Saturday as students who were packing up at the end of the school year learned that three classmates studying in New Zealand were killed when their minivan crashed during a weekend trip.

At least five other students were injured in the accident early Saturday, including one who was in critical condition.

Boston University spokesman Colin Riley said those killed in the accident were Daniela Lekhno, 20, of Manalapan, N.J.; Austin Brashears, 21, of Huntington Beach, Calif.; and Roch Jauberty, 21, whose parents live in Paris.

The students were traveling in a minivan near the North Island vacation town of Taupo when the van drifted to the side of the road and then rolled when the driver tried to correct course, New Zealand police said.

Three of the students died at the scene, police said. Another woman was in critical condition at a hospital, while at least four other students suffered moderate injuries.

Another BU student, Margaret Theriault, was airlifted from the crash site to a hospital in Taupo and was in critical condition, the university said.

Efforts by The Associated Press to reach family members of Lekhno and Brashears were unsuccessful Saturday. A person who answered the phone at the home of Lekhno’s family declined to comment, and a message left at a phone listing for Brashears’ family wasn’t immediately returned.

Brashears’ mother, Julie, told The Boston Globe that he frequently posted new photos on Facebook documenting his adventures in New Zealand, including bungee-jumping off the Auckland Harbor Bridge on his birthday. She said he planned weekend outings for the study abroad group.

“Everyone called him the cruise director,” she said. “He wanted to include everybody on the trips. He loved having an eclectic group of friends.”

Student body president Howard Male, a friend of Brashears, said the Boston University students had posted Facebook updates in anticipation of the trip, saying they hoped to view scenery captured on film in the “Lord of the Rings” movies.

“They were all so excited to be able to go explore what many guidebooks ... have called some of the most beautiful places on the planet,” Male said.

At the university, final exams ended Friday, and there were few outward signs of any socializing on Saturday morning. The student union was deserted. The main activity involved students in the dorms hauling out boxes and pushing rolling bins filled with their belongings to waiting moving trucks or their parents’ cars as they scurried to meet a noon deadline to clear out.

Student Marcelle Richard, who was moving out after finishing her freshman year, said news of the other students’ deaths was “really upsetting.”

“They were abroad, and it’s so sad that something has to happen when you are supposed to be experiencing one of the best times of your life,” said Richard, 18.

Richard, of New Orleans, said the tragedy will not stop her from going abroad to study later in her college career.

“It’s just like tragedies happen, and I don’t want that to stop me from a good learning experience,” she said.

Jordan Nunez, 22, a senior who is graduating next week, said the study abroad program is very popular among Boston University students. He estimates 25 percent to 30 percent of his friends traveled to foreign countries to study.

Still, the New Zealand accident has darkened the mood on campus, he said.

“You think everything’s always taken care for you, but things can happen wherever you are in the world,” he said. “It’s just something that’s sad for our community.”

Study abroad program executive director Bernd Widdig called the students’ deaths an “unprecedented tragedy,” the worst to hit the program since it began in the 1980s. The New Zealand part of the program began in 2003 and involves courses at the University of Auckland and Auckland University of Technology.

About 250 students, faculty members and well-wishers gathered in Boston on Saturday evening for a candlelight vigil for the victims.

Brashears’ girlfriend, junior Tori Pinheiro, cried at the vigil as she recalled how friendly he was and how much she loved him. She said he recently had left her a voicemail saying he missed her and she has been playing it repeatedly.

University President Robert Brown called the students’ deaths “a horrible tragedy” and said in an online statement his “prayers go out to the students and their families.”

All the students except Theriault were enrolled in a BU study abroad program in Auckland, the BU website said. Theriault was enrolled in a study abroad program in Sydney, Australia.

Sixteen students were traveling in two minivans, on their way to hike the Tongariro Crossing, a famous trek rated as one of the most spectacular in New Zealand. The hike crosses a volcanic crater in the central part of North Island.

None of the eight students in the second van was injured. Seven of those eight students were also from Boston University.

Police official Kevin Taylor said it was unclear why the van drifted to the side of the road. He said some of the students were thrown from the vehicle, indicating they may not have been wearing seat belts.

Dean of Students Kenneth Elmore said it was a terrible end to the year at the school, where commencement is scheduled for May 20.

“This is an unusual time on our campus,” Elmore said in a statement on the school website. “We have a lot of people who are traveling and some people who are celebrating the end of final exams. I’d like everyone to please take a moment to pay our respects to the families of those who have been killed.”